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Ch. 2 Chemical Basis of Life Part 1

Total questions: 18

Worksheet time: 10mins

Name
Class
Date
1.

A pure substance made of only one kind of atom is called an _________.

a)

element.

b)

compound.

c)

mixture.

d)

solution.

2.

Fill in the blank: The smallest particle of an element is called an _________.

a)

atom

b)

molecule

c)

cell

d)

compound

3.

Fill in the blank: The dense core of an atom, composed of protons and usually neutrons, is called the _________.

a)

nucleus

b)

electron cloud

c)

valence shell

d)

molecule

4.

A subatomic particle that has a negative charge and encircles the nucleus of an atom is called an _________.

a)

electron

b)

proton

c)

neutron

d)

positron

5.

Fill in the blank: A subatomic particle that has no charge and is found in the nucleus of an atom is called a _________.

a)

neutron

b)

proton

c)

electron

d)

positron

6.

A subatomic particle that has a positive charge and is found in the nucleus of an atom is called a _________.

a)

proton

b)

electron

c)

neutron

d)

positron

7.

Fill in the blank: Atoms of the same element that have different numbers of neutrons are called _________.

a)

isotopes.

b)

ions.

c)

molecules.

d)

compounds.

8.

Fill in the blank: Positively and negatively charged atoms are called _________.

a)

ions.

b)

molecules.

c)

atoms.

d)

neutrons.

9.

Fill in the blank: A chemical bond resulting from the attraction between oppositely charged ions is called an _________.

a)

ionic bond.

b)

covalent bond.

c)

metallic bond.

d)

hydrogen bond.

10.

A chemical bond that involves sharing a pair of electrons between atoms in a molecule is called a _________.

a)

covalent bond

b)

ionic bond

c)

hydrogen bond

d)

metallic bond

11.

A weak bond between a hydrogen atom and an atom of oxygen or nitrogen is called a _________.

a)

hydrogen bond

b)

ionic bond

c)

covalent bond

d)

metallic bond

12.

A particle composed of two or more bonded atoms is called a _________.

a)

molecule.

b)

atom.

c)

ion.

d)

element.

13.

Fill in the blank: A substance that increases the hydrogen ion concentration of a solution is called an _________.

a)

acid

b)

base

c)

salt

d)

solvent

14.

A substance that decreases the hydrogen ion concentration in a solution is called a _________.

a)

base.

b)

acid.

c)

salt.

d)

solvent.

15.

What is the definition of pH?

a)

hydrogen ion concentration

b)

potential of hydrogen

c)

power of hydrogen

d)

partial pressure of hydrogen

16.

What is the definition of acidosis?

a)

pH below 7.35

b)

pH above 7.45

c)

Normal pH level

d)

pH exactly 7.0

17.

What is the definition of alkalosis?

a)

pH above 7.45

b)

pH below 7.35

c)

Normal pH level

d)

pH exactly 7.0

18.

Label the following item